diff options
| author | Dave Martin <Dave.Martin@arm.com> | 2017-10-31 18:51:19 +0300 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-11-03 18:24:21 +0300 |
| commit | 43994d824e8443263dc98b151e6326bf677be52e (patch) | |
| tree | ef769d01442f52999428d241b02b0c849489842b /arch/arm64/include/asm/cpufeature.h | |
| parent | 07d79fe7c22364de34618e58b92a8f091bd7e03d (diff) | |
| download | linux-43994d824e8443263dc98b151e6326bf677be52e.tar.xz | |
arm64/sve: Detect SVE and activate runtime support
This patch enables detection of hardware SVE support via the
cpufeatures framework, and reports its presence to the kernel and
userspace via the new ARM64_SVE cpucap and HWCAP_SVE hwcap
respectively.
Userspace can also detect SVE using ID_AA64PFR0_EL1, using the
cpufeatures MRS emulation.
When running on hardware that supports SVE, this enables runtime
kernel support for SVE, and allows user tasks to execute SVE
instructions and make of the of the SVE-specific user/kernel
interface extensions implemented by this series.
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cpufeature.h')
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 9b27e8c10086..ac67cfc2585a 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -273,7 +273,8 @@ static inline bool system_uses_ttbr0_pan(void) static inline bool system_supports_sve(void) { - return false; + return IS_ENABLED(CONFIG_ARM64_SVE) && + cpus_have_const_cap(ARM64_SVE); } /* |